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242 results on '"Shen, Zhangfeng"'

56. In situ rapid synthesis of ionic liquid/ionic covalent organic framework composites for CO2 fixation.

Author

Xu, Zhifeng, Wang, Wenting, Chen, Bowei, Zhou, Haitao, Yao, Qiufang, Shen, Xianjie, Pan, Yuchen, Wu, Dongxian, Cao, Yongyong, Shen, Zhangfeng, Liu, Yanan, Xia, Qineng, Li, Xi, Zou, Xiaoqin, Wang, Yangang, and Jiang, Lingchang

Subjects
IONIC liquids, ADSORPTION capacity, HETEROGENEOUS catalysts, EPOXY compounds, RING formation (Chemistry), DURABILITY
Abstract

IL/ICOF composites were in situ synthesized via a one-pot route in half an hour under ambient conditions for catalytic cycloaddition of CO2 with epoxides into cyclic carbonates. The prepared composites feature a decent CO2 adsorption capacity of 1.63 mmol g−1 at 273 K and 1 bar and exhibit excellent catalytic performance in terms of yield and durability. This work may pave a new way to design and construct functionalized porous organic frameworks as heterogeneous catalysts for CO2 capture and conversion. [ABSTRACT FROM AUTHOR]

Published
2023
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58. In situ rapid synthesis of ionic liquid/ionic covalent organic framework composites for CO2 fixation

Author

Xu, Zhifeng, primary, Wang, Wenting, additional, Chen, Bowei, additional, Zhou, Haitao, additional, Yao, Qiufang, additional, Shen, Xianjie, additional, Pan, Yuchen, additional, Wu, Dongxian, additional, Cao, Yongyong, additional, Shen, Zhangfeng, additional, Liu, Yanan, additional, Xia, Qineng, additional, Li, Xi, additional, Zou, Xiaoqin, additional, Wang, Yangang, additional, and Jiang, Lingchang, additional

Published
2023
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61. Investigation on the evolution of hydrothermal biochar

Author

Li, Ming, primary, Wang, Yang, additional, Shen, Zhangfeng, additional, Chi, Mingshu, additional, Lv, Chen, additional, Li, Chenyang, additional, Bai, Li, additional, Thabet, Hamdy Khamees, additional, El-Bahy, Salah M., additional, Ibrahim, Mohamed M., additional, Chuah, Lai Fatt, additional, Show, Pau Loke, additional, and Zhao, Xiaolin, additional

Published
2022
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81. Understanding the water molecule effect in metal-free B-based electrocatalysts for electrochemical CO2 reduction.

Author

Meng, Yuxiao, Xu, Zhangmeng, Shen, Zhangfeng, Xia, Qineng, Cao, Yongyong, Wang, Yangang, and Li, Xi

Abstract

Electrocatalytic CO2 reduction (CO2RR) is a feasible and economical way to eliminate CO2via converting it into useful products. However, this process is hampered by the lack of highly active and stable catalysts. Against this backdrop, single and double boron atom-doped bismuthene catalysts (B@Bi and B2@Bi) for the CO2RR were designed. The nature of the CO2 activation and reduction mechanisms on B@Bi and B2@Bi was explored using density functional theory (DFT) and ab initio molecular dynamics simulations (AIMD). The results indicate that the most feasible product is CH4 on B@Bi, while the C2H4 product is both thermodynamically and kinetically favored on B2@Bi. Moreover, water molecules were also introduced to explore their effects on the CO2RR performance. In an environment with 30H2O molecules, hydrogen bonding interactions between the water molecules and the intermediate reduce the η values of CH4 (0.25 V) on B@Bi and C2H4 (0.90 V) on B2@Bi compared to those in the gas phase. The thermodynamic potential-determining step (PDS) for CH4 synthesis changes from *OCH in the gas phase to *OCH2 formation on B@Bi due to the number of hydrogen bonds and intermediates with different polarity. C–C coupling is still the PDS for C2H4 generation on B2@Bi. The calculation of the hydrogen evolution reaction (HER) as a reaction competitive with the CO2RR shows that B@Bi and B@Bi offer excellent selectivity in the water environment. This work provides useful insights into the development of highly efficient metal-free CO2RR electrocatalysts and highlights the critical role of hydrogen bonding with water molecules in CO2RR. [ABSTRACT FROM AUTHOR]

Published
2022
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84. In Situ Polymerized Polydopamine Nanoparticles as Enhanced Polymer Composite Electrolyte for All‐Solid‐State Lithium‐Ion Batteries.

Author

Chen, Biyun, Huang, Hong, Wang, Yuan, Shen, Zhangfeng, Li, Lifen, Wang, Yan, Wang, Xiaoqiang, Li, Xi, and Wang, Yangang

Subjects
POLYELECTROLYTES, SUPERIONIC conductors, SOLID state batteries, LITHIUM-ion batteries, CONDUCTIVITY of electrolytes, SOLID electrolytes, POLYETHYLENE oxide, IONIC conductivity
Abstract

Polyethylene oxide (PEO) is considered to be an important polymer matrix for solid polymer electrolytes, owing to its excellent lithium salt solubility and low cost, but PEO suffers from many disadvantages such as low ion conductivity at room temperature, poor mechanical property, and flammability. This paper presents the fabrication of a novel composite electrolyte composed of polydopamine (PDA) nanoparticles and PEO through a facile in situ polymerization method. The PDA nanoparticles homogeneously disperse in the PEO matrix and substantially suppress the crystallization of PEO, thus significantly improving the ionic conductivity of PEO electrolyte. Meanwhile, tensile test, thermogravimetric analysis, and cone calorimeter characterizations demonstrate the improved mechanical properties, thermal stability, and flame resistance of the PEO electrolyte. In addition, the PDA/PEO electrolyte shows an expanded electrochemical window, and the all‐solid‐state lithium battery assembled from PDA/PEO electrolyte exhibits better rate performance and cycling stability as compared to the battery made from neat PEO electrolyte. This work provides a simple strategy for safe and high‐performance all‐solid‐state lithium‐ion batteries. [ABSTRACT FROM AUTHOR]

Published
2022
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87. Efficient removal of organic and bacterial pollutants by Ag-La0.8Ca0.2Fe0.94O3-δ perovskite via catalytic peroxymonosulfate activation

Author

Chu, Y., Tan, X., Shen, Zhangfeng, Liu, Pengyun, Han, Ning, Kang, Jian, Duan, Xiaoguang, Wang, Shaobin, Liu, Lihong, Liu, Shaomin, Chu, Y., Tan, X., Shen, Zhangfeng, Liu, Pengyun, Han, Ning, Kang, Jian, Duan, Xiaoguang, Wang, Shaobin, Liu, Lihong, and Liu, Shaomin

Abstract

© 2018 Elsevier B.V. Removal of toxic organics and bacterial disinfection are important tasks in wastewater treatment. Most heavy metal-based catalysts for degradation of aqueous organic pollutants in heterogeneous Fenton-like processes suffer from the toxicity of leached metals. The present work reports environmentally benign systems for both degradation of organics and bacterial disinfection. Calcium substituted LaFeO 3- d perovskite was demonstrated as an efficient catalyst to activate peroxymonosulfate (PMS) for degradation of phenol, methylene blue and rhodamine 6 G. Compared to LaFeO 3- d and nanocrystal Fe 3 O 4 , the lattice oxygen vacancies in B-site cation-deficient perovskite of La 0.8 Ca 0.2 Fe 0.94 O 3 - d (LaCaFeO 3- d ) particles renders this material a greatly improved catalytic performance. Electron paramagnetic resonance (EPR) suggested that both sulfate (SO 4 [rad]–) and hydroxyl radicals ([rad] OH) played critical roles in the advanced oxidation processes. Moreover, silver doped perovskite (Ag-LaCaFeO 3- d )/PMS successfully inhibited the growth of waterborne pathogen Escherichia coli and Methicillin-resistant Staphylococcus aureus (MRSA) at a lower dose than silver ions, proving a synergetic effect between free radicals and Ag + in killing the bacteria. Therefore, Ag-LaCaFeO 3- d /PMS would be promising for practical wastewater treatment.

Published
2018

89. Engineering Carbon-Semiconductor Hybrid Materials for Photocatalysis and Solar Cells

Author

Shen, Zhangfeng and Shen, Zhangfeng

Abstract

Carbon-semiconductor hybrid materials (CSHMs) are promising candidates for solar energy conversion because of their enhanced light harvesting ability and the prolonged charge carrier separation. In this thesis, a series of CSHMs has been successfully fabricated and applied in photocatalysis and dye-sensitized solar cells. The aim of this thesis is to develop cost-effective methods to prepare CSHMs with appropriate morphologies, compositions, and interfacial contact to promote the efficiency of photocatalysis and solar energy conversion.

Published
2017

91. Honeycomb-like g-C3N4/CeO2-xnanosheets obtained viaone step hydrothermal-roasting for efficient and stable Cr(VI) photo-reduction

Author

Liu, Yanan, Shen, Zhangfeng, Song, Jialing, Qi, Huilan, Yin, Chaochuang, Zou, Xuhui, Xia, Qineng, Cui, Lifeng, Li, Xi, and Wang, Yangang

Abstract

This work develops one step in-situhydrothermal-roasting method for preparing honeycomb-like g-C3N4/CeO2nanosheets with abundant oxygen vacancies (g-C3N4/CeO2-x). The g-C3N4/CeO2-xexhibits extend spectral response region and enhanced charge separation efficiency, thus resulting in significantly improved photoactivity for water treatment.

Published
2020
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93. A facile strategy to synthesize Pd/TiO2 nanotube arrays with high visible light photocatalytic performance.

Author

Cui, Lifeng, Pu, Tingting, Shen, Zhangfeng, Li, Shasha, Kang, Shifei, Xia, Qineng, Wang, Yangang, and Li, Xi

Subjects
NANOTUBES, VISIBLE spectra
Abstract

Novel Pd/TiO2 nanotube arrays (Pd/TNTAs) were fabricated by introducing Pd nanoparticles onto TNTAs via a facile deposition-reduction method. Pd nanoparticles can uniformly distribute over the inner and outer surfaces of TiO2 nanotubes by controlling the Pd loading. The hybrid prepared by two deposition-reduction cycles (Pd/TNTAs-2) showed the best visible light absorption and the highest transient photocurrent density compared with the pure TNTAs and other Pd/TNTAs. The Pd/TNTAs-2 sample also showed the best photocatalytic activity and recyclability toward the degradation of Rhodamine B (RhB). As much as 99.7% of RhB could be removed over the Pd/TNTAs-2 film within 2 h under visible light irradiation, which is about three times higher than that over P25 films. The enhancement is attributed to the surface plasmon resonance of Pd nanoparticles and the effective interaction between Pd nanoparticles and TiO2 nanotubes, which improves the charge transfer and reduces the recombination rate of the photogenerated electron-hole pairs. [ABSTRACT FROM AUTHOR]

Published
2019
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95. MXene as a non-metal charge mediator in 2D layered CdS@Ti3C2@TiO2composites with superior Z-scheme visible light-driven photocatalytic activityElectronic supplementary information (ESI) available. See DOI: 10.1039/c9en00567f

Author

Liu, Qiaoran, Tan, Xiaoyao, Wang, Shaobin, Ma, Fang, Znad, Hussin, Shen, Zhangfeng, Liu, Lihong, and Liu, Shaomin

Abstract

Exploitation of photocatalysts towards efficient organic pollutant degradation is highly desirable in the field of environmental remediation. Here, we report a rational synthesis of two-dimensional CdS@Ti3C2@TiO2nanohybrids by facile calcination and a subsequent hydrothermal process. The physico-chemical properties of CdS@Ti3C2@TiO2were investigated by a variety of characterization techniques. The effect of CdS loading on the photocatalytic performance was elucidated. When compared with Ti3C2and Ti3C2@TiO2, the optimal ternary nanostructures exhibited significantly enhanced visible light-driven (λ≥ 420 nm) degradation of sulfachloropyridazine, phenol and several typical dyes. The origin of improved photocatalytic performance mainly stems from the enhanced electron–hole separation efficiency. The charge carrier sinking function of Ti3C2in this first time pre-fabricated three-phase Z-scheme catalyst was proposed based on UV-visible spectroscopy band gap calculation, photoluminescence measurement and photoelectrochemical analysis. The electron paramagnetic resonance assay verified that both superoxide ions and hydroxyl radicals played crucial roles in the removal of contaminants.

Published
2019
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97. Niobium Modification of CeO2Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO2Methanation

Author

Zou, Xuhui, Meng, Yuxiao, Liu, Jianqiao, Cao, Yongyong, Cui, Lifeng, Shen, Zhangfeng, Xia, Qineng, Li, Xi, Zhang, Siqian, Ge, Zhigang, Pan, Yunxiang, and Wang, Yangang

Abstract

CO2methanation has attracted considerable attention as a promising strategy for recycling CO2and generating valuable methane. This study presents a niobium-doped CeO2-supported Ni catalyst (Ni/NbCe), which demonstrates remarkable performance in terms of CO2conversion and CH4selectivity, even when operating at a low temperature of 250 °C. Structural analysis reveals the incorporation of Nb species into the CeO2lattice, resulting in the formation of a Nb–Ce–O solid solution. Compared with the Ni/CeO2catalyst, this solid solution demonstrates an improved spatial distribution. To comprehend the impact of the Nb–Ce–O solid solution on refining the electronic properties of the Ni–Ce interfacial sites, facilitating H2activation, and accelerating the hydrogenation of CO2* into HCOO*, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis and density functional theory (DFT) calculations were conducted. These investigations shed light on the mechanism through which the activity of CO2methanation is enhanced, which differs from the commonly observed CO* pathway triggered by oxygen vacancies (OV). Consequently, this study provides a comprehensive understanding of the intricate interplay between the electronic properties of the catalyst’s active sites and the reaction pathway in CO2methanation over Ni-based catalysts.

Published
2023
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98. Cover Feature: In Situ Polymerized Polydopamine Nanoparticles as Enhanced Polymer Composite Electrolyte for All‐Solid‐State Lithium‐Ion Batteries (ChemElectroChem 3/2022).

Author

Chen, Biyun, Huang, Hong, Wang, Yuan, Shen, Zhangfeng, Li, Lifen, Wang, Yan, Wang, Xiaoqiang, Li, Xi, and Wang, Yangang

Subjects
LITHIUM-ion batteries, POLYELECTROLYTES, POLYMERIZED ionic liquids, NANOPARTICLES, POLYETHYLENE oxide
Abstract

Polymer composite electrolytes, polyethylene oxide, polydopamine, lithium-ion batteries, all-solid-state batteries Cover Feature: In Situ Polymerized Polydopamine Nanoparticles as Enhanced Polymer Composite Electrolyte for All-Solid-State Lithium-Ion Batteries (ChemElectroChem 3/2022) Keywords: polymer composite electrolytes; polyethylene oxide; polydopamine; lithium-ion batteries; all-solid-state batteries EN polymer composite electrolytes polyethylene oxide polydopamine lithium-ion batteries all-solid-state batteries 1 1 1 02/21/22 20220211 NES 220211 B The Cover Feature b illustrates the construction of a polydopamine/PEO composite electrolyte by a mussel-adhesive inspired strategy. [Extracted from the article]

Published
2022
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100. Correction: MXene as a non-metal charge mediator in 2D layered CdS@Ti3C2@TiO2composites with superior Z-scheme visible light-driven photocatalytic activity

Author

Liu, Qiaoran, Tan, Xiaoyao, Wang, Shaobin, Ma, Fang, Znad, Hussein, Shen, Zhangfeng, Liu, Lihong, and Liu, Shaomin

Abstract

Correction for ‘MXene as a non-metal charge mediator in 2D layered CdS@Ti3C2@TiO2composites with superior Z-scheme visible light-driven photocatalytic activity’ by Qiaoran Liu et al., Environ. Sci.: Nano, 2019, DOI: 10.1039/c9en00567f.

Published
2019
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